Synchronous drive belt This is a special belt drive. The working surface of the belt is made into tooth shape, and the rim surface of the pulley is also made into corresponding tooth shape. The belt and pulley are mainly driven by meshing. The synchronous toothed belt generally uses thin steel wire rope as a strong layer, and is coated with polychlorohydrin or neoprene.

When the flat drive belt drives, the belt is sleeved on the smooth wheel surface and is driven by the friction between the belt and the wheel surface. The transmission types include open drive, cross drive and semi-cross drive, which are respectively suitable for different relative positions and different rotation directions of the driving shaft and the driven shaft. The flat belt drive has simple structure, but is easy to slip, and is usually used for transmission with a transmission ratio of about 3.